add net worker steps to 1ES official build (#2898)

eng/templates/build.yml

@@ -54,6 +54,13 @@ jobs:
             pattern: '*DurableTask.dll'
             signType: dll
 
+      - template: ci/sign-files.yml@eng
+        parameters:
+            displayName: Sign assemblies
+            folderPath: 'src/Worker.Extensions.DurableTask/bin/Release'
+            pattern: '*DurableTask.dll'
+            signType: dll
+
       # dotnet pack
       # Packaging needs to be a separate step from build.
       # This will automatically pick up the signed DLLs.
@@ -66,6 +73,19 @@ jobs:
             packDirectory: $(build.artifactStagingDirectory)
             nobuild: true
 
+
+      # dotnet pack
+      # Packaging needs to be a separate step from build.
+      # This will automatically pick up the signed DLLs.
+      - task: DotNetCoreCLI@2
+        displayName: 'dotnet pack Worker.Extensions.DurableTask.csproj'
+        inputs:
+            command: pack
+            packagesToPack: 'src/**/Worker.Extensions.DurableTask.csproj'
+            configuration: Release
+            packDirectory: $(build.artifactStagingDirectory)
+            nobuild: true
+
       # Remove redundant symbol package(s)
       - script: |
           echo *** Searching for .symbols.nupkg files to delete...